High-pressure gas cylinder

ABSTRACT

An improved high-pressure gas cylinder is provided, which includes a container and a plug. The container has an air passage which communicates an interior of the container with an exterior of the container. The plug includes a body and a sealing sheet, wherein the body is fixed in the air passage. The body has a hole which communicates with the interior of the container, and the sealing sheet covers the hole. The body and the sealing sheet are integral. Whereby, the plug is able to tightly seal the container to reduce the possibility of wasting gas; additionally, the manufacturing process would be less complicated and efficient with the simplified plug.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates generally to a gas cylinder with fixedvolume, and more particularly to an improved high-pressure gas cylinder.

2. Description of Related Art

High-pressure gas cylinders are commonly used in inflators of air bagsin vehicles. More specifically, when a car has a high-speed collision, asealing sheet which seals a high-pressure gas cylinder installed in thecar would be pierced by a piercing tube. Therefore, the high-pressuregas in the cylinder inflates an air bag instantly to ensure the safetyof the driver or passengers.

A conventional high-pressure gas cylinder includes a sealing sheet and aplug, wherein the sealing sheet covers an opening of the cylinder, andis fixed by the plug. However, the sealing sheet and the plug aredetachably connected to each other so that a gap tends to be formedtherebetween, which may cause the high-pressure gas cylinder not to betightly sealed, and the gas in the cylinder may subsequently escapethrough the gap.

Additionally, in the manufacturing process of a high-pressure gascylinder, more components used to seal the cylinder take more steps inassembly. On the other hand, in an ideal manufacturing process, once thecylinder is filled with gas, sealing components should be able to sealthe cylinder immediately to prevent the gas from escaping, and thereforeto reduce waste of gas and the manufacturing cost. Accordingly, it is animportant issue for manufacturers to simplify the components of ahigh-pressure gas cylinder, as well as to tightly seal the cylinder inthe manufacturing process.

BRIEF SUMMARY OF THE INVENTION

In view of the above, the primary objective of the present invention isto provide an improved high-pressure gas cylinder, which includes anintegral plug without separable components or any gaps between thecomponents. In addition, in the manufacturing process, the plug sealsthe cylinder immediately upon the cylinder is filled with gas to avoidthe gas from escaping.

The present invention provides an improved high-pressure gas cylinder,which includes a container and a plug, wherein the container has an airpassage which communicates an interior of the container with an exteriorof the container. The plug includes a body and a sealing sheet, whereinthe body is fixed in the air passage. The body has a hole whichcommunicates with the interior of the container, and the sealing sheetcovers the hole. The body and the sealing sheet are integral.

Whereby, by using the integral plug, it not only reduces the possibilityof wasting gas, but also simplifies the manufacturing process of thehigh-pressure gas cylinder.

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

The present invention will be best understood by referring to thefollowing detailed description of some illustrative embodiments inconjunction with the accompanying drawings, in which

FIG. 1 is a partial sectional view of a first preferred embodiment ofthe present invention, showing the improved high-pressure gas cylinder;

FIG. 2 is a schematic diagram of the manufacturing device for thehigh-pressure gas cylinder in FIG. 1;

FIG. 3 is a partial enlarged view of FIG. 2, showing the gas is pouredinto the container through the air chamber;

FIG. 4 is a partial enlarged view of FIG. 3, showing the plug seals thecontainer, and the ring wall which surrounds the opening of thecontainer is deformed to form the stop ring;

FIG. 5 is a partial sectional view of a second preferred embodiment ofthe present invention, showing the sealing sheet is provided at thebottom of the hole of the plug; and

FIG. 6 is a partial sectional view of a third preferred embodiment ofthe present invention, showing an inner sealing ring is embedded in theplug.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 1, high-pressure gas cylinder 100 includes a container10, a plug 20, and an outer sealing ring 30.

The container 10 has an air passage 12 which communicates an interior ofthe container with an exterior of the container 10. The air passage 12has a first air passage 121 and a second air passage 122 whichcommunicates with the first air passage 121, wherein the first airpassage 121 communicates with the exterior of the container 10, and thesecond air passage 122 communicates with the interior of the container10. An internal diameter of the first air passage 121 is greater thanthat of the second air passage 122, and a stop surface 12 a is formedbetween the first air passage 121 and the second air passage 122.

The plug 20 is located in the first air passage 121, and has a topsurface 20 a and a bottom surface 20 b, wherein the top surface 20 afaces the exterior of the container 10, and the bottom surface 20 bfaces the interior of the container 10. In addition, the plug 20includes a body 22 and a sealing sheet 24. The body 22 has a firstsection 221 and a second section 222 connected to the first section 221,wherein the bottom surface 20 b of the plug 20 is formed on the firstsection 221. The bottom surface 20 b of the plug 20 contacts the stopsurface 12 a of the container 10. An external diameter of the secondsection 222 is smaller than that of the first section 221, wherein thetop surface 20 a of the plug 20 is formed on the second section 222, anda shoulder 223 is formed between the first section 221 and the secondsection 222.

The body 22 has a hole 22 a thereof which communicates with the interiorof the container 10. The sealing sheet 24 and the body 22 are integral,more specifically, the sealing sheet 24 and the body 22 are formed as anintegral and non-detachable piece. The sealing sheet 24 is a metal sheetin the first preferred embodiment, and is provided inside the hole 22 ato cover the hole 22 a. The sealing sheet 24 in the first preferredembodiment is provided at a top of the hole 22 a, wherein the top of thehole 22 a is close to the exterior of the container 10. With suchdesign, the top surface 20 a of the plug 20 is formed on both thesealing sheet 24 and the second section 222. Whereby, by using theabovementioned integral plug 20, the waste of gas due to gas escapingfrom gaps between components would be reduced. Additionally, the plug 20could be fixed in the air passage 12 of the container 10, for theproblem of loose components no longer exists.

The plug 20 is connected to the container 10 through the manufacturingmethod and device illustrated in FIG. 2 to FIG. 4. The manufacturingdevice 1 for the high-pressure gas cylinder 100 includes an upper pushrod 2 and a lower push rod 3, which are able to be forced to move towardopposite directions respectively. The upper push rod 2 is connected to aholding member 4, and the lower push rod 3 is connected to a pressingmember 5, wherein the plug 20 is clutched by the pressing member 5, andis drivable to move by the pressing member 5. On the other hand, thecontainer 10 is fixed between the holding member 4 and the plug 20.

As shown in FIG. 3, the manufacturing device 1 further has an airchamber 6 and two intake pipes 7. The air chamber 6 is space formedbetween the container 10 and the plug 20, and communicates with theinterior of the container 10. The two intake pipes 7 are used to pourgas into the air chamber 6, and afterwards into the interior of thecontainer 10. Once the container 10 is filled with gas, both the upperpush rod 2 and the lower push rod 3 are moved toward the container 10,and the plug 20 is accordingly pushed into the first air passage 121 ofthe container 10 by the pressing member 5. On the other side, the bottomof the container 10 is held by the holding member 4 to avoid movingupwards by the push of the pressing member 5.

As depicted in FIG. 4, the plug 20 is pushed to abut against the stopsurface 12 a of the container 10 with the bottom surface 20 b thereof.At the same time, a ring wall which surrounds an opening of thecontainer 10 is deformed to form a bend-shaped stop ring 14, which abutsagainst the shoulder 223 of the body 22. Whereby, the body 22 is fixedinto the first air passage 121 through abutting against the stop surface12 a as well as the stop ring 14 of the container 10.

Therefore, with the integral plug 20, the container 10 is able to besealed through a single pressing process. Such manufacturing process isnot only simplified but also time-saving.

In addition, the body 22 in the first preferred embodiment further hasan outer circular groove 221 a formed on an outer wall of the firstsection 221, wherein the outer sealing ring 30 is embedded in the outercircular groove 221 a, and the outer sealing ring 30 abuts against apassage wall of the air passage 12 of the container 10 with an outersurface thereof, which is shown in FIG. 1. In this way, the outersealing ring 30 is able to prevent gas from escaping through the firstair passage 121, which reduces the possibility of wasting gas.

As shown in FIG. 5, a high-pressure gas cylinder 200 includes not onlythe container 10 but also a plug 40. The plug 40 includes a body 42 anda sealing sheet 44, wherein the body 42 has a hole 42 a communicatingwith the interior of the container 10, and the sealing sheet 44 coversthe hole 42 a. The difference between the plug 40 in the secondpreferred embodiment and the plug 20 in the first preferred embodimentis that, the sealing sheet 44 is provided at a bottom of the hole 42 a,wherein the bottom of the hole 42 a is close to the interior of thecontainer 10. With such design, partial of a bottom surface of the plug40 is formed on the sealing sheet 44. Whereby, a piercing tube (notshown) would pass through the hole 42 a before piercing the sealingsheet 44, wherein the piercing tube would abut against the wall of thehole 42 a. In this way, once the sealing sheet 44 is pierced by thepiercing tube, gas in the container 10 could almost rush into thepiercing tube without escaping from the hole 42 a, which also reducesthe waste of gas in the container 10.

A high-pressure gas cylinder 300 illustrated in FIG. 6 also includes acontainer 10, and further includes a plug 50 and an inner sealing ring60. The plug 50 includes a body 52 and a sealing sheet 54, wherein thebody 52 includes a first section 521 which is close to the interior ofthe container 10, and a second section 522 which is close to theexterior of the container 10. Similar to the body 42, the body 52 has ahole 52 a communicating with the interior of the container 10, whereinthe sealing sheet 54 is provides at a bottom of the hole 52 a, whereinthe bottom of the hole 52 a is close to the interior of the container10.

Especially, the body 52 has an inner circular groove 521 a formed on awall surrounding the hole 52 a, and the inner sealing ring 60 isembedded in the inner circular groove 521 a. An internal diameter of theinner sealing ring 60 is slightly smaller than a diameter of the hole 52a, which makes an inner surface of the inner sealing ring 60 positioninto the hole 52 a. With such design, the piercing tube would tightlyabut against the inner surface of the inner sealing ring 60 once thepiercing tube pierces the sealing sheet 54, which makes sure that gasfrom the container 10 would not escape from the hole 52 a, and gas inthe container 10 would be effectively used.

It must be pointed out that the embodiment described above is only apreferred embodiment of the present invention. All equivalent structureswhich employ the concepts disclosed in this specification and theappended claims should fall within the scope of the present invention.

What is claimed is:
 1. A high-pressure gas cylinder, comprising: acontainer having an air passage which communicates an interior of thecontainer with an exterior of the container; and a plug comprising abody and a sealing sheet, wherein the body is located in the airpassage; the body has a hole which communicates with the interior of thecontainer, and the sealing sheet covers the hole; the body and thesealing sheet are integral.
 2. The high-pressure gas cylinder of claim1, wherein an outer circular groove is formed on an outer wall of thebody; the high-pressure gas cylinder further has an outer sealing ringembedded in the outer circular groove, wherein the outer sealing ringabuts against a passage wall of the air passage with an outer surfacethereof.
 3. The high-pressure gas cylinder of claim 1, wherein an innercircular groove is formed on a wall surrounding the hole of the body;the high-pressure gas cylinder further has an inner sealing ringembedded in the inner circular groove.
 4. The high-pressure gas cylinderof claim 2, wherein an inner circular groove is formed on a wallsurrounding the hole of the body; the high-pressure gas cylinder furtherhas an inner sealing ring embedded in the inner circular groove.
 5. Thehigh-pressure gas cylinder of claim 1, wherein the air passage of thecontainer has a first air passage and a second air passage whichcommunicates with the first air passage; the first air passagecommunicates with the exterior of the container, and the second airpassage communicates with the interior of the container, wherein aninternal diameter of the first air passage is greater than that of thesecond air passage, and a stop surface is formed between the first airpassage and the second air passage; the plug is fixed in the first airpassage, wherein a bottom surface of the plug contacts the stop surfaceof the container.
 6. The high-pressure gas cylinder of claim 5, whereinthe container has a stop ring surrounding an opening of the container,and formed by bending; the body has a first section and a second sectionconnected to the first section, wherein the bottom surface of the plugis formed on the first section; an external diameter of the secondsection is smaller than that of the first section, and a shoulder isformed between the first section and the second section; the stop ringof the container abuts against the shoulder of the body.
 7. Thehigh-pressure gas cylinder of claim 1, wherein the sealing sheet of theplug is provided at a top of the hole of the body; the top of the holeis close to the exterior of the container.
 8. The high-pressure gascylinder of claim 1, wherein the sealing sheet of the plug is providedat a bottom of the hole of the body; the bottom of the hole is close tothe interior of the container.